Definition
The breakage, deformation, or separation of an aircraft's structural components — such as wings, tail, control surfaces, or fuselage — while the aircraft is airborne, typically caused by aerodynamic loads exceeding the airframe's design limits.
Plain English
Part of the aircraft physically breaks while it is flying. This usually happens because the airframe was pushed beyond what it was built to handle.
Context Anchor
Seen in discussions of spiral instability, high-speed descending turns, aircraft limitations, and loss-of-control scenarios.
Why Pilots Care
Leads to immediate loss of the aircraft and is the ultimate outcome to avoid when recovering from high-speed spiral dives.
Grounding Statement
In a tightening, descending spiral, the airplane can be loaded harder and faster than it was built to withstand.
Intuition Check
Do not read “failure” here as simply “the airplane did not perform well.” In this context, it means the aircraft structure is damaged, bent, broken, or no longer able to carry the forces on it.
Example Sentence 1
If a spiral dive is allowed to continue, airspeed can build past Vne and lead to inflight structural failure.
Example Sentence 2
Exceeding the never-exceed speed can produce loads that cause inflight structural failure within seconds.